On Sun, 7 Jun 2020 at 13:03, Heinrich Schuchardt xypron.glpk@gmx.de wrote:
Am June 7, 2020 8:59:00 AM UTC schrieb Ard Biesheuvel ardb@kernel.org:
On Sat, 6 Jun 2020 at 22:49, Heinrich Schuchardt xypron.glpk@gmx.de wrote:
On 6/6/20 10:32 PM, Heinrich Schuchardt wrote:
On 6/6/20 7:15 PM, Ard Biesheuvel wrote:
QEMU's mach-virt machine only supports selecting CPU models that implement the virtualization extensions, and are therefore
guaranteed
to support LPAE as well.
I wonder why qemu-system-arm -machine virt -cpu help lists cortex-a9 (which is not LPAE enabled).
But when I try to use it I get qemu-system-arm: mach-virt: CPU type cortex-a9-arm-cpu not
supported
This looks like a missing feature in QEMU.
This is not a missing feature. The virt board uses PSCI for powerdown and reset, and to bring up secondary cores. PSCI requires the HVC instruction, which is only available if the virt extensions are implemented.
By missing feature I meant -cpu help output should be filtered according to the -machine value if provided.
Ah fair enough. Yes, that would be useful.
Unfortunately, ARM does not permit me to contribute to QEMU, so hopefully someone else can take this on.